1128960

Appears in sequences

• Number of 1-factorizations of K_{n,n}.at n=6A000479
• a(n) = n! * C(n,2).at n=6A001804
• Number of similarity classes of descendants created by bisection refinement from an initial n-simplex.at n=5A019999
• Triangle of coefficients in expansion of x^n in terms of Laguerre polynomials L_n(x).at n=38A021012
• Triangle of coefficients in expansion of x^n in terms of Laguerre polynomials L_n(x).at n=42A021012
• Sum of divisors of k such that k and k+1 have the same number and sum of divisors.at n=17A054005
• Sum of divisors of central binomial coefficient binomial(n, floor(n/2)).at n=20A064139
• Triangle read by rows: T(n,k) = 2^k * (n!/k!)*binomial(n-1,k-1).at n=30A086915
• Triangle read by rows: T(n,k) = number of functions from [1,2,...,n] to [1,2,...,n] such that the image contains exactly k elements (0<=k<=n).at n=43A090657
• Duplicate of A000479.at n=5A094050
• Triangle read by rows: T(n,h) = number of functions f:{1,2,...,n}->{1,2,...,n} such that |Image(f)|=h; h=1,2,...,n, n=1,2,3,... . Essentially A090657, but without zeros.at n=34A101817
• Weight enumerator of [64,30,14] extended BCH code.at n=10A109486
• Weight enumerator of [64,30,14] extended BCH code.at n=22A109486
• A triangular sequence from coefficients of an expansion of the Poisson's kernel: p(t,r)=(1-r^2)/(1-2*r*Cos(t)+r^2): r->t;Cos(t)->x.at n=33A137511
• Triangular array: rows are the f-vectors of simplicial complexes dual to permutohedra of type D_n.at n=34A145902
• List of pairs (a(n),b(n)): f(n) = A004001(n); a(n) = f(n) + a(n-1); b(n) = f(n)*b(n-1).at n=25A154280
• Partial products of A004001.at n=12A172452
• T(n,k)=Number of n X n 0..n+k-2 arrays with new values 0 upwards introduced in row major order and every value unique in its row and column.at n=20A182236
• Triangle T(n, k) read by rows, T(n, k) = n!*binomial(n, k).at n=38A196347
• Triangle T(n, k) read by rows, T(n, k) = n!*binomial(n, k).at n=42A196347